(} MAMMALIA. 



broader form from British caves, which Sir E. Owen had called 

 M. latidens. The same opinion was expressed in the Geological 

 Survey Memoir (Vertebrata of the Forest Bed, p. 21, 1882), and 

 more recently Mr. R. Lydekker (Quart. Journ. Geol. Soc., 

 Vol. XLIL, p. 309, 1886), when considering the affinities of a 

 lower jaw of this genus, which had been found in the Forest- 

 bed of Kessingland, and described by Mr. J. Backhouse (Ibid., 

 p. 309), came practically to the same conclusion, namely, that the 

 Forest-bed form of Machcerodus seemed to be the M. cultridens ; 

 but that the evidence was not sufficient to justify a reference of 

 the specimens to that species. 



If, as Dr. E. Fabrini states (Boll. Com. Geol. Ital. Ser. 3, Vol. L, 

 p. 161, 1890), the canines of M. cultidrcns have no crenations, 

 then the Forest-bed Machwrodus cannot belong to that species ; 

 but I am not satisfied that we should be correct in following 

 Dr. Fabrini in referring the Forest-bed specimens to M. crcnatidcns, 

 for it seems to me far from certain that M. crenatidcns is 

 specifically distinct from Owen's M. latidens. 



Mr. K. Fitch has a portion of a large carnassial tooth from the 

 Norwich Crag of Thorpe, very much worn by the opposing 

 teeth ; this may be the tooth which has been thought to be 

 Felis pardoides (Prestwich, Quart. Journ. Geol. Soc., Vol. 

 XXVIL, p. 456, 1871), but it is far too large for that species. 

 The manner in which this tooth is worn makes it look like a 

 tooth of Hycena, but its shape is quite different from any tooth 

 of that animal. The teeth of Machcerodus are sometimes similarly 

 worn away, and as this tooth agrees in size with Machcerodus, it 

 is provisionally referred to that genus. The tooth of the closely 

 allied genus Eusmilus figured by Mr. Lydekker (Cat. Foss. 

 Mamm. Brit. Mus., Part v., p. 311, 1887) may be compared 

 with this. 



The genus Machcerodus occurs in Miocene beds at Eppelsheim. 

 In the Pliocene of Pikermi, Mont L^beron, Mont Perrier, 

 the Val d' Arno, and in India ; possibly also in the Norwich Crag of 

 Britain. It is also met with in the Norfolk Forest-bed, as well as 

 in Pleistocene beds of Britain and on the Continent. 



Genns HYJENA, Zimmermann. 

 HY^NA CROCUTA, ERXLEBEN. 



(Spotted Hycena.) 

 PLATE I., FIG. 8, a, b. 



The remains of a large form of Hycena, similar to those which 

 are now generally looked upon as a spelaen variety of H. crocuta, 

 have been obtained from the Forest-bed of Gorton and Kes- 

 singland, near Lowestoft (Geol. Mag. Dec., 2, Vol. X., p. 433, 

 1883, and Quart. Journ. Geol. Soc., Vol. XXXIX, p. 580, 

 1883), they are in the possession of Mr. J. J. Colman at Gorton, 



